Hi,
as already discussed many times, the LeastSquares modules was a mistake since
1) it was hard to come up with an API that's useful for everybody
2) the same thing is easy to do e.g. from a SVD decomposition.
Actually it was a remnant of the Eigen 1.0 days....
So i just removed it.
I didn't even put it in Eigen2Support because it requires several
other modules. But if you want we can always create a new module,
Eigen2Support_LeastSquares...
Benoit